Art of pressure distillation



Patented Feb. 4,1930 1,745,931

UNITED STATES, PATENT, oFF-mr:

301mm 1. numrnnnxs, orwnrrma, IN IANA, .assreivon 'ro s'ranmmn OIL com- IBANY, or wnrrme, INDIANA, A conronnrrorror INDIANA.

ART OF PRESSURE DISTILLA'IION no Drawing. Application filed April 9, 1921. Serial No. 460,002.

The present invention. relates to the production of gasoline from heavier hydrocarbon oils under the action of heat andpressure and more particularl to its production from hydrocarbon oil distlllates' or fractions hava ing a boiling point range between 340 and 600 F.; such as kerosene, naphtha bottoms and the like, which: have not been'susceptible .of cracking under pressure distillation as hitherto practiced.

x In accordance with the present invention a hydrocarbon oil distillate having a boiling point range between 340 and 600 F. is placed in a, suitable still, for exam le, one

5 such as that described'in mgl co en g application Serial No. 435,700 ed an. 7, 1921-, and subjected to distillation under pressures I in excess of 300 pounds per square inch. For example, I may treat na htha bottoms which is a bottom or residue 0 tained on redistillation of a fraction or distillate containing gas- .oline, kerosene and heavier oils. An average distillation record of such a material shows a gravity of 35.5 to 36.5 B., an initial boiling'point of 340-400 F. and 95 to 98% ofi at 600 F. The naphtha bottoms are charged into a still and are heated under a pressure in excess of 300 lbs. per square inch, say 325 lbs. The liquid still contents attain a temperature of 7 40-765 F. The vapors evolved, which contain a large proportion of gasoline constituents, may suitably be condensed under the distillation pressure, or, if desired, underatmospheric pressure or an intermediate ressure between atmospheric andthe disti lation pressure. The distillate contains a large proportion of asoline, constituents (upwards of an may be redistilled, for example, with steam, for the separation 40 of the gasoline.

I claim: 7 The process -of manufacturing asoline which. comprises heating naphtha ttoms under apressure of about 325 lbs. per square inch to a temperature of 740 765 F.,' condensing the evolved vapors and collecting the distillate.

ROBERT E. HUMPHREYS." 

